Kent · England
Northbourne Sand Mastic
Sand mastic in Northbourne from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Draughts and rain around sash boxes
- Mastic that needs renewing before redecorating
- Silicone on a period window that looks wrong
Sand mastic in Northbourne
Sand mastic is the traditional way to point the gap between a timber window frame and the stone or brick around it. It’s a mix of sand and a linseed-oil-based binder, applied by hand. On period homes, it looks right where silicone wouldn’t. If you’re dealing with cement or filler used on old window joints that has cracked and draughts and rain around sash boxes, we can help, whatever the surface.
Around Northbourne, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
Every job comes with a 12-month guarantee, wherever you are in Kent.
- Location
- Northbourne (CT14)
- Wider area
- Kent
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Your questions about sand mastic in Northbourne
I let a flat near Walmer station. Can you help?
Yes. We work for landlords and agents as well as householders. Just phone 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear price.
Do you cover smaller places like Northbourne?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you do commercial work?
Yes, regularly. Larger jobs can be planned room by room or area by area.
Is it OK to seal over old sealant?
No, because it fails. We remove every bit of old sealant first, so the new sealant bonds properly.
Can you do several jobs on one visit?
Yes. More than one area can be quoted together.
Are you an approved applicator?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we’re fully insured.
Should I check with the council before work on a listed or conservation-area home?
Checking first is sensible. Your local planning authority can say if consent is needed for work on a listed home or in a conservation area.
Is there any odour?
Sometimes, a little. Any smell clears as the sealant cures, and ventilation helps.
Also near Northbourne
Other services in Northbourne
Quotes for sand mastic in Northbourne
The price is agreed before any work begins. It takes into account:
- The number and length of the joints
- Which sealant suits the joint
- Whether there’s mould to deal with
- Whether old sealant or filler has to be cut out
Combining jobs into one visit is usually more efficient than separate visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
What to tell us for a quote
When you contact us, these details help:
- The problem you’ve noticed
- The rough size of the job
- The type of property
- Any previous sealing or DIY work
Getting a quote is simple: let us know the job and the location. Photos by email help us understand the job, and we’ll come back to you with a quote.
Leave it or put it right?
New sash windows are a major, costly change and on a listed home, consent may be needed. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. Where a wall is exposed, as many are in small places like Northbourne, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why Northbourne customers choose us
- Any old sealant cut out fully, not covered over
- Full insurance on every job
- Domestic, commercial and hotel work
- Approved under the ARBOMaster scheme
Take a look at our cost guide and customer reviews.
How to look after the new joints
To keep the joints looking good and working properly:
- Plan mastic work ahead of painting
- Go gently near the mastic when preparing windows
- Inspect the joints round the windows every year or so
- Check with your local planning authority if your home is listed
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
Renewing mastic before redecorating saves doing it twice. Painting over failed mastic hides the problem for a while.
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.
For anyone letting property in or around Northbourne, several properties can go on one quote. Just tell us the addresses and what each one needs, and photos by email help.
Different surfaces, different methods
Period and listed homes
A traditional finish suits a period property.
Brick reveals
Sand mastic is also used where timber frames meet brick. It suits older brickwork.
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
What sand mastic looks like in Northbourne
With historic houses such as Walmer Castle (about 3 miles south-east) nearby, there’s older building stock in the area around Northbourne as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For site and facilities teams at buildings such as Northbourne Church of England Primary School, the mastic around its windows and doors needs looking after like any other building’s. For landlords with property near Walmer station, older sash windows in a rental need their mastic kept sound to keep the weather out. In the older streets around Church of St Augustine, the joint between an old wall and a newer frame is usually the first place rain gets in.
Northbourne is about 2 miles west of Deal, in Kent. Our applicators cover sand mastic for homes and businesses in Northbourne and nearby, as part of our work across Kent. 922 places in Kent are on our list, from the larger towns to small villages. There’s also a page for Chelmsford, about 51 miles away.
Postcode districts we cover here for sand mastic: CT14. That includes homes and businesses on Deal Road, Coulson Grove and Mill Lane. We also cover the places around Northbourne: Marley (1 mile north), Great Mongeham (1 mile south-east), Finglesham (1 mile north), Sholden Meadows (1 mile east) and Sholden (1 mile east). Further out, we also cover Canterbury (12 miles west), Margate (11 miles north), Dover (6 miles south), Folkestone (12 miles south-west), Ramsgate (9 miles north) and Broadstairs (11 miles north).
What’s near Northbourne
Typical jobs here are in homes near Castle Community College, Hare & Hounds pub and Betteshanger Park and the streets around them. The closest station to Northbourne is Walmer station, roughly 2.2 miles south-east. Other landmarks nearby include Deal Castle (2.8 miles east) and Kent Museum of the Moving Image (2.7 miles east). Green spaces nearby include Monk's Wall nature reserve.
How the visit works
The work is kept neat and contained to the joints we’re treating, so you can get on with your day. Expect the work to take a few hours per window, depending on the condition of the joints. Somewhere like Northbourne needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Deep voids are packed so the mastic is the right thickness.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
Before we arrive
- Mention any leaks or damp you’ve noticed
- Let us know about parking restrictions
- Mention any tricky access
Get a quote
We quote each job on its own, so the first step is telling us about yours. Simply phone 0345 464 0079 or email us and describe the job.